Ecc 3:11 He has made everything beautiful in its time. Also, he has put eternity into man's heart, yet so that he cannot find out what God has done from the beginning to the end. (ESV)Jesus is the firstborn from the dead. This is understood that he is Chief- born from the dead. He is the first Chief and the last.
But the “I Am Alpha and Omega, the beginning and the end”
Refers to His God and Father.
Yahweh:
Isa 44:6 Thus says the LORD, the King of Israel and his Redeemer, the LORD of hosts: “I am the first and I am the last; besides me there is no god. (ESV)
Isa 46:10 declaring the end from the beginning and from ancient times things not yet done, saying, ‘My counsel shall stand, and I will accomplish all my purpose,’ (ESV)
Isa 48:12 "Listen to me, O Jacob, and Israel, whom I called! I am he; I am the first, and I am the last. (ESV)
Rev 1:8 “I am the Alpha and the Omega,” says the Lord God, “who is and who was and who is to come, the Almighty.” (ESV)
Jesus:
Rev 22:13 "I am the Alpha and the Omega, the first and the last, the beginning and the end.” (ESV)
Also:
1Ti 6:15 which he will display at the proper time—he who is the blessed and only Sovereign, the King of kings and Lord of lords,
1Ti 6:16 who alone has immortality, who dwells in unapproachable light, whom no one has ever seen or can see. To him be honor and eternal dominion. Amen. (ESV)
Rev 17:14 They will make war on the Lamb, and the Lamb will conquer them, for he is Lord of lords and King of kings, and those with him are called and chosen and faithful.” (ESV)
Rev 19:16 On his robe and on his thigh he has a name written, King of kings and Lord of lords. (ESV)
"The Alpha and the Omega," "the first and the last," "the beginning and the end"--they're all different ways of saying the same thing. These are titles of God used of Jesus, as are "King of kings" and "Lord of lords."